Subordinated Debt and Junior Subordinated Debt - Schedule of Junior Subordinated Debt by Trusts (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2019
Wesbanco Capital Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	3.15%
Variable rate based on the three-month LIBOR plus, current rate	5.11%
Wesbanco Capital Statutory Trust III [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	3.10%
Variable rate based on the three-month LIBOR plus, current rate	5.05%
Wesbanco Capital Trust IV [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	4.55%
Wesbanco Capital Trust V [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	4.55%
Wesbanco Capital Trust VI [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.77%
Variable rate based on the three-month LIBOR plus, current rate	3.67%
Oak Hill Capital Trust 2 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.40%
Variable rate based on the three-month LIBOR plus, current rate	4.40%
Oak Hill Capital Trust 3 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.30%
Variable rate based on the three-month LIBOR plus, current rate	4.30%
Oak Hill Capital Trust 4 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Variable rate based on the three-month LIBOR plus, current rate	3.56%
Community Bank Shares Statutory Trust I [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	4.55%
Community Bank Shares Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.70%
Variable rate based on the three-month LIBOR plus, current rate	3.59%
First Federal Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Variable rate based on the three-month LIBOR plus, current rate	3.49%
Regal MD Statutory Trust I [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.85%
Variable rate based on the three-month LIBOR plus, current rate	4.75%
Regal MD Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Variable rate based on the three-month LIBOR plus, current rate	3.49%